Academic literature on the topic 'Factorial degree'
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Journal articles on the topic "Factorial degree"
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GARCÍA SÁNCHEZ, P. A., I. OJEDA, and A. SÁNCHEZ-R.-NAVARRO. "FACTORIZATION INVARIANTS IN HALF-FACTORIAL AFFINE SEMIGROUPS." International Journal of Algebra and Computation 23, no. 01 (2013): 111–22. http://dx.doi.org/10.1142/s0218196713500033.
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Let [Formula: see text] be the monoid generated by [Formula: see text] We introduce the homogeneous catenary degree of [Formula: see text] as the smallest N ∈ ℕ with the following property: for each [Formula: see text] and any two factorizations u, v of a, there exist factorizations u = w1,…,wt = v of a such that, for every k, d (wk,wk+1) ≤ N, where d is the usual distance between factorizations, and the length of wk, |wk|, is less than or equal to max{|u|, |v|}. We prove that the homogeneous catenary degree of [Formula: see text] improves the monotone catenary degree as upper bound for the ordinary catenary degree, and we show that it can be effectively computed. We also prove that for half-factorial monoids, the tame degree and the ω-primality coincide, and that all possible catenary degrees of the elements of an affine semigroup of this kind occur as the catenary degree of one of its Betti elements.
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DI GENNARO, VINCENZO, and DAVIDE FRANCO. "FACTORIALITY AND NÉRON–SEVERI GROUPS." Communications in Contemporary Mathematics 10, no. 05 (2008): 745–64. http://dx.doi.org/10.1142/s021919970800296x.
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Let X ⊂ ℙ2m+1 be a projective variety with isolated singularities, complete intersection of a smooth hypersurface of degree k, with a smooth hypersurface F of degree n > k. Denote by NSm(F) and NSm(X) the mth Néron–Severi groups. We prove that if rkNSm(F) = 1, then rkNSm(X) = 1. Moreover, we prove that if [Formula: see text] is general and n > max {k, 2m + 1}, then the natural map NSm(X) ⊗ ℚ → NSm(F) ⊗ ℚ is surjective. When X is a threefold, we deduce that X is factorial if and only if rkNS2(F) = 1. This allows us to prove the existence of factorial threefolds with many singularities.
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Pena-Cerezo, Artaraz-Minon, and Tejedor-Nunez. "Analysis of the Consciousness of University Undergraduates for Sustainable Consumption." Sustainability 11, no. 17 (2019): 4597. http://dx.doi.org/10.3390/su11174597.
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This research seeks to measure the degree of consciousness for sustainable consumption in a wide sample of university students. The interest of this study is to analyze if students’ choice of degree, as well as their progress in university education, influences the development of the dimensions that construct the consciousness for sustainable consumption. The study is completed by means of a questionnaire survey aimed at first and final year students of seven university degrees across four different faculties. A factorial analysis of principal components is performed to analyze the dimensions of sustainability and robust contrasts of mean differences are conducted to observe the differences by degrees and years. The results indicate that the measurement scale of the variable consciousness for sustainable consumption maintains its original structure when applied to a sample of Spanish university students. Although there are significant differences by degree in the development of awareness about sustainable consumption, the authors cannot conclude that the training received at the degree level helps to improve the level of awareness of students in their decisions for responsible behavior in consumption.
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Caballer-Tarazona, María, Rubén José Cuñat Giménez, Rosario Martínez Verdú, and Cristina Pardo-García. "¿Por qué eligen los estudiantes universitarios las titulaciones de turismo?. Análisis de los factores de interés y expectativas de empleo para el alumnado de la Universitat de València." Cuadernos de Turismo, no. 44 (November 28, 2019): 43–65. http://dx.doi.org/10.6018/turismo.44.404731.
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Las expectativas del alumnado que determinan la elección de una titulación en Turismo condicionan sus conductas durante y después de sus estudios. Para identificar estas expectativas se realizó una encuesta al alumnado de Turismo de primer curso. Un análisis factorial nos ha permitido identificar los factores de mayor peso en la elección: Internacionalización, Expectativas de empleo, Emprendimiento, Importancia del sector e Interés por la titulación. Finalmente, se ha completado el estudio analizando sus expectativas sobre las salidas profesionales vinculadas al ámbito turístico. Interests that drive students to choose a Tourism degree will condition their behaviour in their studies and later on. In order to identify such interests we carried out a survey addressed to the first year Tourism students. A factorial analysis was conducted finding the main factors in the degree choice: Internationalization, Job expectations, Entrepreneurship, Sector importance and Interest for the degree. Finally, we completed the research identifying the expectations about their professional future in the tourism field.
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Moguerza, Javier M., Juan José Fernández-Muñoz, Andrés Redchuk, Clara Cardone-Riportella, and Esperanza Navarro-Pardo. "Factor structure and stability of a quality questionnaire within a postgraduate program." Anales de Psicología 33, no. 2 (2017): 351. http://dx.doi.org/10.6018/analesps.33.2.256711.
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<p>In this work we describe an instrument based on the use of a factor analysis technique in order to measure the quality of education within a Postgraduate degree offered by a public Spanish university. We showed that the instrument has satisfactory psychometric properties (reliability and validity). Regarding the factorial solution, three main dimensions have been determined, namely: importance given to the subject; educational resources and knowledge of the subject (previous and posterior). It is important to remark that these three dimensions were consistently detected in all the factorial analyses performed (total sample and separate academic years). These three dimensions should be considered as fundamental when designing an instrument to evaluate educational quality. These findings may be taken as a basis for the design of future strategies for the evaluation of educational quality on other type of degrees within the higher education area.</p>
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Hoffman, Eric. "Countertransference: A Typological Expansion." Psychological Reports 73, no. 2 (1993): 408–10. http://dx.doi.org/10.2466/pr0.1993.73.2.408.
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Countertransference was viewed from the perspective of a 2 × 2 × n factorial typology (source × degree of consciousness × depth). This typology incorporated the conscious and unconscious influences of nonpsychological variables and their theoretical schema upon the analyst's therapeutic recommendations.
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Mousa, E. A. "Mathematical Analysis of the Reduction of Wüstite at Different Basicity Using Factorial Design." Journal of Metallurgy 2014 (December 16, 2014): 1–8. http://dx.doi.org/10.1155/2014/201659.
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Numerical prediction is performed on the reduction of wüstite under simulated blast furnace conditions using factorial design approach. Wüstite sinter samples with different basicity (0.5, 1.0, and 2.0) are reduced with a gas mixture consisting of 30% CO, 10% H2, 5% CO2, and 55% N2 at 950–1100°C. In all cases, the reduction degree of wüstite increased with basicity and temperature. A 23 factorial design is applied to derive a regression model based on the experimental data of acidic (CaO/SiO2 = 0.5) and basic (CaO/SiO2 = 2.0) wüstite which is reduced at 950°C and 1100°C for 5 and 35 min. The developed mathematical model is applied to predict the reduction degree of wüstite at different basicity (0.5, 1.0, and 2.0), interval of time (5–35 min), and temperatures (950, 1000, 1050°C, and 1100°C). In general, the results of the driven models are found to be in good agreement with the experimental data of reduction of wüstite in many cases. The MATLAB program is used to carry out the required calculations.
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Delaroza, Fernanda, Miroslava Rakocevic, Galileu B. Malta, Patricia M. Sanchez, Roy E. Bruns, and Ieda S. Scarminio. "Factorial design effects of plant density, pattern and light availability on the caffeine, chlorogenic acids, lipids, reducing sugars and ash contents of Coffea arabica L. beans and leaves." Analytical Methods 9, no. 24 (2017): 3612–18. http://dx.doi.org/10.1039/c7ay00721c.
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Factorial design experiments were executed to determine the effects of plant pattern and density as well as the degree of light availability on the caffeine, chlorogenic acids, lipids, reducing sugars and ash contents of beans and leaves ofCoffea arabicasamples.
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Beierl, Esther T., Markus Bühner, and Moritz Heene. "Is That Measure Really One-Dimensional?" Methodology 14, no. 4 (2018): 188–96. http://dx.doi.org/10.1027/1614-2241/a000158.
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Abstract. Factorial validity is often assessed using confirmatory factor analysis. Model fit is commonly evaluated using the cutoff values for the fit indices proposed by Hu and Bentler (1999) . There is a body of research showing that those cutoff values cannot be generalized. Model fit does not only depend on the severity of misspecification, but also on nuisance parameters, which are independent of the misspecification. Using a simulation study, we demonstrate their influence on measures of model fit. We specified a severe misspecification, omitting a second factor, which signifies factorial invalidity. Measures of model fit showed only small misfit because nuisance parameters, magnitude of factor loadings and a balanced/imbalanced number of indicators per factor, also influenced the degree of misfit. Drawing from our results, we discuss challenges in the assessment of factorial validity.
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Lambin, A. I. "Studying joint influence of a number of factors on borehole cleaning." Earth sciences and subsoil use 44, no. 4 (2021): 448–57. http://dx.doi.org/10.21285/2686-9993-2021-44-4-448-457.
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Studying the behavior of cuttings transport under various conditions using experimental observations and computational fluid dynamics is the main method for analyzing the influence of cuttings, fluid and operating parameters on well cleaning. Despite the existing abundant models and recommendations of researchers, still there are problems with the accuracy of determining the cuttings layer height, critical velocity and other key parameters, which complicates the task of effective solution of the problem of borehole cleaning. The purpose of the study is to analyze the models obtained via the organization of a full factorial experiment and variance analysis to identify the influence of such factors as viscosity and flow rate of the drilling fluid in the annular space and the inclination angle of the well on the degree of cuttings transport. The studies of the kind are carried out using special devices called flow loops. Experimental data were taken from literature sources. To organize a full factorial experiment, the data of the dependent variable were combined into a combinational square, which simplified the coding of factor values. After setting the full factorial experiment, the models were obtained that made it possible to assess the contribution of the studied factors to the process of destruction product removal within the intervals determined while setting the research tasks. The obtained models allowed to determine the influence degree of each of the factors on the process under investigation. The results of the succeeding analysis of variance confirmed the indicated degree of influence and determined the rank of each of the factors in percentage.
Dissertations / Theses on the topic "Factorial degree"
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Гой, Т. П., та О. В. Шевчук. "Нові інтегральні функції, породжені центральними факторіалами". Thesis, Сумський державний університет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/39349.
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Гой, Т. П., та Р. А. Заторський. "Про одну неелементарну функцію типу інтеграла Доусона". Thesis, Сумський державний університет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/39347.
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Ishaque, Mohammed. "A new method for calculating the economic benefits of varying degrees of power factor correction for industrial plant loads." PDXScholar, 1992. https://pdxscholar.library.pdx.edu/open_access_etds/4322.
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A comparative study of the economic benefits that can be obtained from different degrees of power factor correction for medium and small scale industrial installations is shown. A new approach for precise calculation of kws and kvars required at different power factors is presented. These calculated values are used to find the return on investments for the capacitors needed for power factor correction. The developed method is easy to use, cost effective, accurate and will help electrical engineers with minimum knowledge of power systems to precisely determine the savings available by improving the power factor of an industrial load.
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Mitchell, Moana Erika. ""All we got to see were factories." : scoping Maori transitions from secondary school : a thesis submitted to the Victoria University of Wellington in partial fulfilment of the requirements for the degree of Master of Arts in Education /." ResearchArchive@Victoria e-Thesis, 2009. http://hdl.handle.net/10063/1244.
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Bois, Jean-Marie. "Corps enveloppants des algèbres de Lie en dimension infinie et en caractéristique positive." Phd thesis, Université de Reims - Champagne Ardenne, 2004. http://tel.archives-ouvertes.fr/tel-00371835.
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Soient g une k-algèbre de Lie, U(g) son algèbre enveloppante, K(g) le corps des fractions de U(g). L'objet de cette thèse est d'étudier des propriétés algébriques du corps gauche K(g) dans les deux cas suivants : d'une part si k est de caractéristique 0 et g est de dimension infinie ; d'autre part si k est de caractéristique positive et g est de dimension finie.<br /><br />On suppose k de caractéristique nulle. On définit d'abord la notion de "degré de transcendance de niveau q" pour les algèbres de Poisson. Cette notion est introduite à partir de la notion de dimension de niveau q définie par V. Pétrogradsky pour les algèbres associatives et les algèbres de Lie. On démontre, sous des hypothèses peu restrictives sur g, que le degré de transcendance de niveau q+1 de K(g) est égal à la dimension de niveau q de g.<br /><br />On s'attache ensuite à l'étude de la famille des algèbres de type Witt définies par R. Yu. On construit ainsi des familles infinies de corps gauches deux à deux non isomorphes mais de même degré de transcendance de niveau 3 donné. On étudie aussi la question des centralisateurs dans les corps enveloppants des parties positives des algèbres de type Witt. On établit en particulier le résultat suivant : il existe des algèbres de Lie non commutatives de dimension infinie g telles que le premier corps de Weyl ne se plonge pas dans K(g).<br /><br />Supposons maintenant k de caractéristique p>0. On étudie le cas particuliers des algèbres de Lie suivantes : les algèbres gl(n) ; les algèbres sl(n) lorsque p ne divise pas n ; l'algèbre de Witt modulaire W(1) et une sous-algèbre P de l'algèbre de Witt W(2) (s'identifiant à un produit tensoriel de l'algèbre de Lie W(1) avec une algèbre associative de polynômes tronqués). Dans tous les cas, on démontre que le corps enveloppant est isomorphe à un corps de Weyl. Pour les algèbres W(1) et P, on démontre en outre que le centre de l'algèbre enveloppante est un anneau factoriel, en accord avec une conjecture récente de A. Braun et C. Hajarnavis.
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Chou, Ching Hsiang, and 周清祥. "The Relation Between Worker-shortage Degree And Management About Coil-center Factories." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/49329446746269156309.
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碩士<br>國立臺北大學<br>企業管理學系<br>88<br>Abstract
Although the government has permitted foreign labor into our industries since 1994,worker-shortage is still one of the most important problems to many kinds of factories today. In this research paper, I intend to study the relation between the industrial characters and worker-shortage, and between the management system and worker-shortage. Furthermore, I will provide some suggestions for the government and the steel coil-center industry to overcome this serious problem.
According to the previous related studies and the opinions gathered from visiting the experts, I found out 30 variables about the worker-management system. Then I issued 96questionnaires to 96 of the 105 related factories from the 1999-2000 members of Taiwan Steel &Iron Industry Association (TSIIA) and later received 56 copies, the effective return rate of 58.3%. To take the use of chi-square test, these samples don’t show the variance difference and thus it proves that they are representative. After factor analysis five factors are extracted out of the above 30 variables and the total variance explained is 67.4%, demonstrating the representativity of these data. The five factors are: (1) the incentive system,(2) the benefit system,(3) the recruit system,(4) the team potential inspiration management system and(5) the need-satisfactory management system.
The result of this research shows: (1) Factories located in northern Taiwan suffer from more or higher worker-shortage rate than those in southern Taiwan.(2) Factories with 48 working hours or more per week suffer from higher worker-shortage than those with less working hours.(3) carbon steel product factories suffer from higher worker-shortage than stainless steel product factories. According to the above, I recommend that factories with higher worker-shortage follow the government policy to shorten working hours and to produce higher value-added products.
As for the relation between the worker-shortage degree and the above five factors, through MANOVA analysis, I find that the high work-shortage group or the medium worker-shortage group do better than no worker-shortage ones or less worker-shortage ones on“ the team potential inspiration management system” and “the need-satisfactory management system”. I recommend that the government carefully execute the policy of decreasing foreign worker policy to avoid destroying the business environment.
Book chapters on the topic "Factorial degree"
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Dutta, P. S., and Tin-Lup Wong. "Inverse Kinematic Analysis of Moving Base Robot with Redundant Degrees of Freedom." In CAD/CAM Robotics and Factories of the Future. Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-52326-7_24.
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Dutta, P. S., and Tin-Lup Wong. "Inverse Kinematic Analysis of Moving Base Robot with Redundant Degrees of Freedom." In CAD/CAM Robotics and Factories of the Future. Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-662-39962-0_24.
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Chareton, Christophe, Sébastien Bardin, François Bobot, Valentin Perrelle, and Benoît Valiron. "An Automated Deductive Verification Framework for Circuit-building Quantum Programs." In Programming Languages and Systems. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-72019-3_6.
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AbstractWhile recent progress in quantum hardware open the door for significant speedup in certain key areas, quantum algorithms are still hard to implement right, and the validation of such quantum programs is a challenge. In this paper we propose Qbricks, a formal verification environment for circuit-building quantum programs, featuring both parametric specifications and a high degree of proof automation. We propose a logical framework based on first-order logic, and develop the main tool we rely upon for achieving the automation of proofs of quantum specification: PPS, a parametric extension of the recently developed path sum semantics. To back-up our claims, we implement and verify parametric versions of several famous and non-trivial quantum algorithms, including the quantum parts of Shor’s integer factoring, quantum phase estimation (QPE) and Grover’s search.
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Dentale, Francesco, Michele Vecchione, and Claudio Barbaranelli. "Applying the IAT to Assess Big Five Personality Traits." In Advances in Psychology, Mental Health, and Behavioral Studies. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-6599-6.ch001.
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This chapter reviews the studies that applied the Implicit Association Test (IAT) to assess the Big Five personality traits, focusing on issues related to measurement and validity. After a brief introduction on the implicit self-concept of personality, the following five issues are critically reviewed: (1) the experimental procedure of both classical and questionnaire-based Big Five IATs, (2) the factorial structure and reliability of the implicit traits and the degree of dissociation between implicit and explicit measures, (3) the state and trait components of implicit scores, (4) the predictive validity of the Big-Five IATs with respect to relevant behavioural criteria, and (5) the robustness to faking of the Big Five IATs. Future research directions for the implicit measures of the Big Five were discussed.
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Rajagopal, Ananya. "Offer Attractiveness, Decision Conflict, and Consumer Response." In Start-Up Enterprises and Contemporary Innovation Strategies in the Global Marketplace. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-4831-7.ch018.
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Consumer responses to attractive offers, both in terms of consumer satisfaction with the decision process and in terms of subsequent store choice behavior, have been analyzed in this paper through a factorial analysis process, conducted in Mexico in reference to consumer choice and decision satisfaction variables. The results suggest that consumer response to attractive offer is driven to a large extent by two factors: the effect of a discount sale on the available options of goods and the degree of store loyalty. Overall, the discussion of results of the four studies presented in the paper demonstrates that consumer response to clearance sales, both in terms of decision satisfaction levels and attractiveness of retails stores, are strongly influenced by the variables of price sensitivity, attractiveness of products, loyalty and perceived value on available brands.
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Pereira, Rex Eugene. "Turning Browsers into Buyers." In Internet Marketing Research. IGI Global, 2001. http://dx.doi.org/10.4018/978-1-878289-97-1.ch007.
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The chapter investigates the interaction effects between the search strategy of software agents and the consumer’s product class knowledge in the context of consumers seeking to purchase cars on the Internet. The research design used was a 2 x 4, between groups, completely randomized, two-factor, factorial design. The independent variables which were manipulated were product class knowledge (HIGH KNOWLEDGE, LOW KNOWLEDGE) and agent search strategy (elimination by aspects (EBA STRATEGY), weighted average method (WAD STRATEGY), profile building (PROFILE STRATEGY), simple hypertext (HYPERTEXT STRATEGY)). The dependent variables which were measured were satisfaction with the decision process (SATISFACTION), confidence in the decision (CONFIDENCE), trust in the agent’s recommendations (TRUST), propensity to purchase (PURCHASE), perceived cost savings (SAVINGS), and cognitive decision effort (EFFORT). Significant differences were found in the affective reactions of the subjects toward the agent/application depending on the level of product class knowledge possessed by the subjects. Subjects with high product class knowledge had more positive affective reactions towards agents/applications which used the WAD and EBA strategies as compared to the PROFILE strategy. Subjects with low product class knowledge had more positive affective reactions to agents/applications which used the PROFILE strategy as compared to the EBA and WAD strategies. When the systems were modified to increase the amount of information provided and to increase the degree of control provided to the subjects, their affective reactions to the agents/applications were found to be different from the original study. Subjects responded more positively to the previously “less preferred” strategy, thus weakening the interaction effect.
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Gordon, Robert B., and Patrick M. Malone. "Work in Factories." In The Texture of Industry. Oxford University Press, 1994. http://dx.doi.org/10.1093/oso/9780195058857.003.0016.
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Factories, and the factory system, are at the heart of the American industrial experience. Since the 1790s, Americans have developed many different types of factories and varieties of work within each of them. It is a terrible mistake to think of factory workers as simply automatons who do some type of mindless, repetitive task, day in and day out. The average American has never been in a factory and knows very little about what actually goes on there. Typically, there are dozens of employee classifications in one of these highly organized and hierarchical workplaces. A person employed in a factory might be a sweeper, vatman, machine operator, machine fixer, machinist, toolmaker, millwright, stockroom supplier, shipper, overseer, foreman, draftsman, electrician, or engineer. Machine operation, only one form of factory work, requires widely varying levels of skill, depending on the type of machine and the pace of production. Some jobs are routine and undemanding, but others challenge the intellect and manual dexterity of even the most skilled and experienced employees. There are tasks to be performed by one person as well as group activities that require extensive social interaction. The work culture of the factory is, and has always been, far more complex and dynamic than an organizational chart would imply. Although factory work frequently included operations done by hand and processes that did not require any motive power, all true factories used some power-driven machinery. Mechanization was a key element in the development of the factory system. Additionally, the owners of many factories followed the principle of uniformity, aiming to make standardized products from parts that were, to some degree, interchangeable. The first American factories, as we have seen in Chapter 8, were textile mills; but soon after Americans began to make yarn in places like the Slater Mill, they were also shifting the manufacture of products such as clocks, firearms, and edge tools from craft shops to factories. In the 1790s, Samuel Slater’s youthful operatives tended a sequence of special-purpose machines powered by a waterwheel.
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Schott, Peter, Matthias Lederer, Sina Niedermaier, Freimut Bodendorf, and Matthias Hafner. "A Maturity Model to Organize the Multidimensionality of Digitalization in Smart Factories." In Handbook of Research on Applied Optimization Methodologies in Manufacturing Systems. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-2944-6.ch017.
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Smart Factory concepts describe fully networked, autonomous factories and form an essential part of flexible, but still highly efficient production systems. The requirements for the further development of existing production environments towards a Smart Factory are multidimensional and vastly complex. Many companies therefore fail in the structured realization of a holistic Smart Factory concept. They either focus one dimension of the challenge or merely address the maximum penetration of powerful technologies. This chapter addresses this issue and describes a systematic development path towards a Smart Factory by means of a domain specific maturity model. Based on the analysis of existing maturity models, requirements are derived which must be considered when realizing a Smart Factory. In total, 20 design fields (e.g., degree of intelligence, communication protocols, human-machine-interface and IT security) and respective detail descriptions result from this research. They holistically structure the relevant fields of action to pursue a Smart Factory.
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Toma, Ioan, José María García, Iker Larizgoitia, and Dieter Fensel. "A Semantically Enabled Service Delivery Platform." In Mobile Computing and Wireless Networks. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-4666-8751-6.ch016.
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It is expected that virtual factories and enterprises of the future will be able to self-organize in distributed, autonomous, interoperable, non-hierarchical, innovation ecosystems and be dynamically delivered as services, end-to-end along the global value chain. In this scenario, services and service ecosystems become central artifacts, and it is necessary to model and manage them appropriately for automation and scalability. Two main popular architectural approaches for realizing service orientation are WSDL-based SOA and the RESTful style. The level of automation offered by these approaches is limited, and human intervention is required in order to achieve most of the service-related tasks such as discovery, ranking, invocation, and monitoring. In order for service-oriented technologies to scale, they need to offer a significant degree of automation. To address the scalability issues in service composition, this chapter proposes a semantically enabled service-oriented architectural approach (SESA) and its implementation in the form of a platform. The authors detail the principles, models, architecture, and implementation underlying the approach in which lightweight semantics play a central role.
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Toma, Ioan, José María García, Iker Larizgoitia, and Dieter Fensel. "A Semantically Enabled Service Delivery Platform." In Advances in Systems Analysis, Software Engineering, and High Performance Computing. IGI Global, 2014. http://dx.doi.org/10.4018/978-1-4666-6178-3.ch008.
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It is expected that virtual factories and enterprises of the future will be able to self-organize in distributed, autonomous, interoperable, non-hierarchical, innovation ecosystems and be dynamically delivered as services, end-to-end along the global value chain. In this scenario, services and service ecosystems become central artifacts, and it is necessary to model and manage them appropriately for automation and scalability. Two main popular architectural approaches for realizing service orientation are WSDL-based SOA and the RESTful style. The level of automation offered by these approaches is limited, and human intervention is required in order to achieve most of the service-related tasks such as discovery, ranking, invocation, and monitoring. In order for service-oriented technologies to scale, they need to offer a significant degree of automation. To address the scalability issues in service composition, this chapter proposes a semantically enabled service-oriented architectural approach (SESA) and its implementation in the form of a platform. The authors detail the principles, models, architecture, and implementation underlying the approach in which lightweight semantics play a central role.
Conference papers on the topic "Factorial degree"
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Westermann, Hans-Henrik, Andreas Kruse, Eva Eisinger, and Rolf Steinhilper. "Development of an Energy-Efficient Cutting Edge Geometry for Solid End Mills: A Design of Experiments-Based Approach." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46151.
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Milling operations are commonly characterized by high energy consumptions and should be in focus for optimizations aiming sustainable manufacturing processes. Research results show that within milling operations, especially in small and medium enterprises (SME), up to 80% of the applied milling cutters are solid end mills. The paper presents a design of experiments (DOE)-based optimization of the cutting edge geometry, to improve the energy efficiency and technical capability of solid end mills. Thereby the paper describes the fractional factorial design for the first-degree polynomial model as well as the subsequent set up of a central composite design (CCD) with its second-degree polynomial model for the optimization of relevant target parameter like cutting performance, tool wear and surface quality. Based on the results of more than one hundred machining tests this comprehensive approach shall contribute to the development of new cutting edge geometries of solid end mills and thereby lead to more energy-efficient machining operations in milling applications.
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Li, Bing, Boon-wai Shiu, and Kwok-jing Lau. "Fixture Configuration Design for Sheet Metal Laser Welding With a Two-Stage Response Surface Methodology." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/dac-21096.
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Abstract In this paper a two-stage response surface methodology is developed for the robust fixture configuration design of sheet metal laser welding. The first stage is to optimally determine the Robust Design Space (RDS) where the relatively less-sensitive design over the entire feasible design space can be obtained. A weighted objective function combining both robustness and performance are taken in this stage. The degree of metal fit-up is taken as performance characteristic. Within RDS a second-order response surface model is fitted by a 3k fractional factorial design in the second stage. Thus, based on the new methodology the robust design results under the new fixturing scheme can be obtained. Illustrative example shows that the presented method can lead to a robust fixturing scheme and the influential design locators can be detected.
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Bamberger, Judith Ann, and Perry A. Meyer. "Investigating Using Oscillating Jets for Fluid Mixing." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-69037.
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Scaled mixing experiments were conducted to evaluate maintaining mobilized particles in a uniform suspension (the condition of concentration uniformity) using jet pumps to mix the suspension. The study experimentally evaluated uniformity in a 1/12-scale experiment varying the Reynolds number, Froude number, and gravitational settling parameter space. The product of the jet exit velocity and nozzle diameter (U0D0) was used to scale the experimental conditions. The test matrix included a full factorial test between 100% and 50% U0D0 and two half-factorial tests at 75% and 25% U0D0. Evaluating points at 75% U0D0 and 50% U0D0 allowed evaluation of curvature. Eliminating points at 25% U0D0 decreased the testing time by several weeks. Test conditions were achieved by varying the simulant viscosity (μ), the mean particle size (dp), and the jet nozzle exit velocity (U0). Concentration measurements at sampling locations throughout the tank were used to assess the degree of uniformity achieved during each test. Concentration data was obtained using a real time ultrasonic attenuation probe and discrete batch samples. The undissolved solids concentration at these locations was analyzed to determine whether the tank contents were uniform (&lt; ±10% variation about mean) or nonuniform (&gt; ±10% variation about mean) in concentration. Concentration inhomogeneity was modeled as a function of dimensionless groups. The two parameters that best describe the maximum solids volume fraction that can be suspended in a double-shell tank were found to be 1) the Froude number (Fr) based on nozzle velocity (U0) and tank contents level (H) and 2) the dimensionless particle size (dp/D0). The dependence on the Reynolds number (Re) does not appear to be statistically significant.
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Frey, Daniel D., Geoff Reber, and Yiben Lin. "A Quadrature-Based Sampling Technique for Robust Design With Computer Models." In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-85490.
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Several methods have been proposed for estimating transmitted variance to enable robust parameter design using computer models. This paper presents an alternative technique based on Gaussian quadrature which requires only 2n+1 or 4n+1 samples (depending on the accuracy desired) where n is the number of randomly varying inputs. The quadrature-based technique is assessed using a hierarchical probability model. The 4n+1 quadrature-based technique can estimate transmitted standard deviation within 5% in over 95% of systems which is much better than the accuracy of Hammersley Sequence Sampling, Latin Hypercube Sampling, and the Quadrature Factorial Method under similar resource constraints. If the most accurate existing method, Hammersley Sequence Sampling, is afforded ten times the number of samples, it provides approximately the same degree of accuracy as the quadrature-based method. Two case studies on robust design confirmed the main conclusions and also suggest the quadrature-based method becomes more accurate as robustness improvements are made.
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Morgan, Neal R., Houston G. Wood, and Alexandrina Untaroiu. "Numerical Optimization of Leakage by Multifactor Regression of Trapezoidal Groove Geometries for a Balance Drum Labyrinth Seal." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43794.
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Grove configuration has a direct influence on the performance of the labyrinth seal. In this study, the geometry of the groove cavities in a water balance drum labyrinth seal was varied to investigate the effects on fluid leakage. A design of experiments (DOE) study varied the groove cavity cross-section through various trapezoidal shapes with one or both internal base angles obtuse. The grooves are parameterized by the groove width connected to the jet-flow region, the internal entrance and exit angles, the flat width inside the groove, and the depth. The corners inside the groove cavity are filleted with equal radii. As with the baseline model the grooves are evenly spaced along the seal length and identical copies of each other. The flow path starting at the rear of the pump impeller and proceeding through the seal was created as a 5 degree sector CFD model in ANSYS CFX. Three five-level factorial designs were selected for the cases where the entrance angle is obtuse and the exit angle acute, the exit angle obtuse and entrance angle acute, and both angles were obtuse. The feasible geometries from each factorial design were selected based on the nonlinear geometric constraints and CFD simulation experiments were performed in ANSYS CFX. The leakage results from these simulation experiments were then analyzed by multifactor linear regression to create prediction equations relating the geometric design variables to leakage and enable geometric optimization for minimum leakage. Streamline plots along the seal cross-section were then used to visualize the flow and understand regression trends. This study investigates the effect of groove cavities with obtuse internal entrance and exit angles on vortex size and position and subsequent seal leakage.
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Towse, Adam, Michael Martin, Adrian Allen, and Chris Andrews. "Large Vessel Nozzle Penetration Geometric Optimisation Study in 3D Incorporating Design of Experiments Techniques." In ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78076.
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This paper describes the results of an optimisation study into the effects of changing geometrical variables local to the nozzle entry on a large pressure vessel. The purpose of the study was to quantify the effects of altering the geometry, and thereby provide trade-offs between key responses such as primary strength and shakedown performance. A 3D Finite Element model was built of a 90 degree sector of the pressure vessel which was sufficiently detailed to allow the thermal and structural effects of the vessel remote from the nozzle to be included. Specifically, this included the thermal and structural influence of the closure head and bolting assembly. The model was then parameterised for 5 independent variables, including the extent of the nozzle reinforcement, crotch corner fillet radius and nozzle thickness. The parameterised model was then subjected to a number of thermal and structural transient analyses during Level A operation, as well as a representative strength loadcase. A full factorial design study was undertaken, comprising of separate 243 analysis runs covering the 5 independent variables at 3 levels. A number of output metrics were monitored, and the effects on the output metrics resulting from changes to the inputs were quantified. Due to the full factorial nature of the experimental design, interactions between variables could also be investigated. The response for each output metric was then fitted to a response surface, which allows a polynomial (meta-model) of each metric to be calculated. These responses were input to a simple Excel chart which allows the designers to perform rapid what-if design scenarios, and see the resulting effects of their changes on the responses. This allows the trade-offs between responses, for example shakedown and strength trade-off for shell thickness, to be easily seen and quantified.
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Daniels, Mitchell A., Levi J. Suryan, and John P. Parmigiani. "Effects of Finite Element Damage Modeling Parameters in Carbon Fiber Panels Under Mode III Loading." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50297.
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Modeling the progression of damage is required to fully describe the behavior of advanced composite materials in engineering applications. However, damage progression can be complex and is often difficult to determine. Errors in analyses can arise due to uncertainties in the material parameters associated with damage progression models. The commercial software Abaqus uses the Hashin damage criterion that consists of six strength based damage initiation material inputs and four energy based damage propagation inputs for composite lamina. The initiation inputs consist of the tensile and compressive strengths parallel and perpendicular to the fiber direction, longitudinal shear strength, and transverse shear strength. The damage propagation properties consist of the fracture-energies that define the stress-displacement relationship for tension and compression of the fibers and the matrix. To create an accurate finite element model, it is important to understand the effects of the material properties on the outputs of the analysis. The research presented in this study will determine the effect of the ten damage properties under a specific loading case using an Abaqus finite element model, with a focus on determining when the four damage progression properties have a significant effect. Edge-notched panels under mode III loading with 20 and 40 ply layups consisting of 30% zero degree plies were considered in the study. The explicit solver in Abaqus was used for the panel analysis. To evaluate the effects of the properties, fractional factorial sensitivity studies were used. Fractional factorials allow for a broad screening of several factors at relatively small computational cost. The factorial design used the ten Abaqus Hashin properties as factors at levels of ±50% from their nominal values. The maximum load the panel experienced was used as the metric for comparison. The effects were then calculated, weighted to the sum of all effects, and plotted to compare each factor. For both the 20 and 40 ply panels, the tensile strength in the direction of the fibers was shown to have the largest effect. The 20 ply panel showed a very small effect of the fracture energy of the fiber in tension, while the 40 ply panel showed a greater effect of this parameter. This is due to damage propagation mainly occurring after max load for thinner panels. Thicker panels are able to transfer load to more plies as damage occurs and the material softens. This allows the panel to carry an increased load after initial damage and through damage progression. Therefore the damage propagation has more of an effect on max load for the 40 ply panels. This principle is illustrated by differences in the experimental load displacement curve shapes of the 20 and 40 ply panels. In addition, the analysis showed the thicker panels exhibited more damage at the maximum load. These results illustrate where in the mode III loading case the damage progression properties have a major effect. This can be used to inform future analysis and inform further research into measuring the damage progression of composite materials.
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Qi, Tian, Tao Zhou, Ning Chen, and Juan Chen. "Study on Deposition Motion of Naturally Circulating Particulate Matter in Supercritical Water Based on Factor and Correspondence Analysis." In 2021 28th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/icone28-63677.
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Abstract It is very important to study the deposition of particles in natural circulation of supercritical water to ensure the safe and stable operation of supercritical water reactor. The data of natural circulation loop calculated by ANSYS-CFX simulation software were analyzed by factorial analysis method, and the effects of axial distance, initial particle volume fraction, heating power and particle size on particle deposition were obtained. The results show that the contribution rate of particle size to the deposition rate is the largest, about 36.3%, and the contribution rate of initial particle concentration to the deposition rate is about 15.1%; the interaction between axial distance and heating power is the most obvious, and the interaction effect is the pipe temperature distribution. Through correspondence analysis, the main influencing factors of particle deposition rate at each level were analyzed. The results show that: when the deposition rate is small, the small change of axial distance will also have a greater impact on the deposition of particles; when the deposition rate is further increased, the change of initial particle volume fraction will significantly affect the deposition of particles; when the deposition rate is large, the particle size plays a leading role in the deposition of particles. Both of the two analysis methods show that: in the influence on the deposition of particles in supercritical water natural circulation, the influence degree is particle size &gt; concentration &gt; axial distance &gt; heating power. Based on the two analysis methods, an analysis regression model is established and the volume proportion of particles in natural circulation is predicted.
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Marin, William E., Daniel P. Wiese, and Paul A. Erickson. "An Experimental Investigation of Hydrogen Fumigation in a Small Direct-Injection Diesel Engine During Part-Load Operation." In ASME 2011 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/icef2011-60020.
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Hydrogen enrichment may offer enhanced performance of internal combustion engines. Hydrogen’s high specific energy, wide flammability limits, and high flame speed are all desirable traits that can potentially enhance combustion. However, hydrogen’s low energy density and its need to be produced from another energy source pose significant challenges for implementation. Hydrogen enrichment involves co-firing of hydrogen and another primary fuel. The hydrogen can be aspirated through the intake manifold via fumigation or injected at the port or cylinder with the primary fuel. The effect of hydrogen fumigation in diesel engines has been studied to some degree but is not fully understood. In this research, a single-cylinder four-stroke direct-injection diesel engine was modified for hydrogen fumigation and was instrumented to monitor combustion related performance parameters. This engine is representative of low-cost systems that are widely used in developing nations for agricultural and other low power applications. A factorial design of experiments was implemented to study the effects and interactions of hydrogen fumigation flow rate, injection timing, and diesel fuel flow rate on part-load engine performance. At relatively low energy fractions, hydrogen was found to have statistically insignificant effects on brake torque and indicated mean effective pressure, leading to modest decreases in brake thermal efficiency. Exhaust gas temperature increased with hydrogen enrichment. The coefficient of variance of indicated mean effective pressure decreased with hydrogen enrichment, and visible changes to the in-cylinder pressure trace were observed, particularly when injection timing was retarded. The results of this investigation show that for this specific configuration, hydrogen enrichment is not beneficial to the combustion process. The marginal improvements in coefficient of variance and changes of in-cylinder pressure cannot justify the decrease in thermal efficiency of the engine.
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Kaltofen, Erich, and Austin Lobo. "Factoring high-degree polynomials by the black box Berlekamp algorithm." In the international symposium. ACM Press, 1994. http://dx.doi.org/10.1145/190347.190371.
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